Abstract:
A class of quaternary nitrogen-containing polymeric materials, which upon contact with alkali provide substantial light-absorbing or opacifying properties, is disclosed. The polymeric materials comprise repeating units of the formula: ##STR1## wherein the cyclic quaternary nitrogen-containing moiety is a 2-, 3-, or 4-pyridinium moiety; R.sup.1 and R.sup.2 are independently hydrogen, alkyl, substituted alkyl, cycloalkyl, aryl, aralkyl, alkaryl, halo, or R.sup.1 and R.sup.2 together comprise the atoms necessary to complete a six-membered, substituted or unsubstituted benzenoid ring; R.sup.3 is hydrogen or alkyl; X is an anion; and Y is hydrogen, alkyl, substituted alkyl, cycloalkyl, aryl, aralkyl, alkaryl or halo.
Abstract:
A polyelectrolyte composite of polyvinyl alcohol derivatives; which comprises: an ionically bonded composite of a partial acetal of polyvinyl alcohol modified with diethoxyethyl trimethyl ammonium ion or a partial aminoacetal of polyvinyl alcohol modified with aminoacetal, with a carboxymethyl polyvinyl alcohol or a partial sulfate of polyvinyl alcohol.
Abstract:
Block copolymers of silicones with vinyl pyridine having the formula:
WHERE A IS AT LEAST 25, B IS AT LEAST 10, C IS 1 OR MORE, AND R is selected from monovalent hydrocarbon radicals, y is a whole number that varies from 1 to 12 and Z is an organo-functional substituent compatible with the vinyl pyridine system, and where X is a radical selected from the class consisting of chlorine, fluorine, iodine and bromine. The materials are useful for the formation of permselective membranes and allow the solubilization of silicones in a polar solvent.